EP0930701B1 - Laminated filter - Google Patents

Laminated filter Download PDF

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Publication number
EP0930701B1
EP0930701B1 EP99100880A EP99100880A EP0930701B1 EP 0930701 B1 EP0930701 B1 EP 0930701B1 EP 99100880 A EP99100880 A EP 99100880A EP 99100880 A EP99100880 A EP 99100880A EP 0930701 B1 EP0930701 B1 EP 0930701B1
Authority
EP
European Patent Office
Prior art keywords
electrode
disposed
resonator
electrodes
input
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP99100880A
Other languages
German (de)
French (fr)
Other versions
EP0930701A3 (en
EP0930701A2 (en
Inventor
Hiroshi Shigemura
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Publication of EP0930701A2 publication Critical patent/EP0930701A2/en
Publication of EP0930701A3 publication Critical patent/EP0930701A3/en
Application granted granted Critical
Publication of EP0930701B1 publication Critical patent/EP0930701B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/20—Frequency-selective devices, e.g. filters
    • H01P1/201—Filters for transverse electromagnetic waves
    • H01P1/205—Comb or interdigital filters; Cascaded coaxial cavities
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
    • H03H9/02—Details
    • H03H9/05—Holders; Supports
    • H03H9/10—Mounting in enclosures
    • H03H9/1007—Mounting in enclosures for bulk acoustic wave [BAW] devices
    • H03H9/1035—Mounting in enclosures for bulk acoustic wave [BAW] devices the enclosure being defined by two sealing substrates sandwiching the piezoelectric layer of the BAW device
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/20—Frequency-selective devices, e.g. filters
    • H01P1/201—Filters for transverse electromagnetic waves
    • H01P1/203—Strip line filters
    • H01P1/20327—Electromagnetic interstage coupling
    • H01P1/20336—Comb or interdigital filters
    • H01P1/20345—Multilayer filters
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P7/00—Resonators of the waveguide type
    • H01P7/10—Dielectric resonators
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
    • H03H9/02—Details
    • H03H9/05—Holders; Supports
    • H03H9/0538—Constructional combinations of supports or holders with electromechanical or other electronic elements
    • H03H9/0547—Constructional combinations of supports or holders with electromechanical or other electronic elements consisting of a vertical arrangement
    • H03H9/0561—Constructional combinations of supports or holders with electromechanical or other electronic elements consisting of a vertical arrangement consisting of a multilayered structure

Definitions

  • the present invention relates to the field of laminated filters used for products such as communications equipment.
  • laminated filters are configured by providing resonator electrodes in parallel on an inner layer within a stack of several laminated dielectric sheets, and an I/O electrode at a position facing the resonator electrodes through this inner layer of the dielectric sheets.
  • another resonator electrode and capacitance are connected in series to form a resonator electrode for notching, and connected to the laminated filter.
  • This resonator electrode for notching generates an attenuation pole within the frequency characteristics, steepening the frequency characteristics curve.
  • a conventional dielectric laminated filter in which a plurality of dielectric sheets are laminated is described in EP 0 837 517.
  • the laminated filter comprises a dielectric sheet on which a plurality of resonance electrodes is formed. It further comprises another dielectric sheet having a coupling line connected in series with I/O lines. Said plurality of resonance electrodes are electromagnetic coupled through said coupling line.
  • a laminated filter of the present invention comprises a laminated body created by laminating a plurality of dielectric sheets, a plurality of resonator electrodes disposed on the same layer within an inner part of the laminated body, and a first input-output electrode disposed on the inner part of the laminated body at a position facing one of the resonator electrodes for input through the dielectric sheet, a second input-output electrode disposed on the inner part of the laminated body at a position facing one of the resonator electrodes for output through the dielectric sheet.
  • One end of at least one of the first and second input-output electrodes is connected to a stub electrode which has one open-circuit end, and which is disposed at a position not overlapping said resonator electrodes.
  • Said plurality of resonator electrodes are electromagnetic coupled by a coupling electrode which is disposed facing portions of said resonatorrelectrodes and which is unconnected to the input-output electrodes.
  • the stub electrodes By connecting the stub electrodes to the I/O electrodes, a large attenuation is achieved and, at the same time, the size of the laminated filter can be reduced.
  • a laminated filter in a preferred embodiment of the present invention is explained with reference to Figs. 1 to 4.
  • dielectric sheets 1a to le are made of generally rectangular ceramic dielectric sheets but other shapes may be used. These dielectric sheets 1a to 1e are laminated together to form laminated body 2 including a plurality of inner dielectric sheets 1b, 1c and 1d forming an inner part.
  • Input-output (I/O) terminals 3a and 3b and ground terminals 4a and 4b are disposed, as shown in Fig. 1, at the side faces of the laminated body 2.
  • the I/O terminals 3a and 3b are disposed on opposed side faces.
  • One of two resonator electrodes 5 forms part of an input resonance circuit, and the other forms part of an output resonance circuit. These two resonator electrodes 5 are disposed on dielectric sheet 1c. For each resonator electrode 5, one end is connected to the ground terminal 4a, forming a short-circuit end 5a, and the other end extends towards ground terminal 4b and forms an open-circuit end 5b.
  • I/O electrodes 6 are disposed on dielectric sheet 1d. One end of each I/O electrode 6 is connected to a corresponding I/O terminal 3a or 3b. The other end of each I/O electrode 6 is located at a position facing the open-circuit end 5b of one of the resonator electrodes 5 for input and output through the dielectric sheet 1c, forming input-output (I/O) capacitance 7 shown in Fig. 3.
  • a coupling electrode 8 is disposed on dielectric sheet 1d. Coupling electrode 8 is disposed facing portions of both resonator electrodes 5which are placed side by side, and through the dielectric sheet 1c, creating an inter-stage coupling capacitance 9 shown in Fig. 3.
  • a loading capacitor electrode 10 is disposed on the dielectric sheet 1d. One end of the loading capacitor electrode 10 is connected to the ground terminal 4b, and the other end is disposed at a position facing the open-circuit end 5b of the resonator electrode 5 through the dielectric sheet 1c, creating a loading capacitance 11 shown in Fig. 3.
  • Shielding electrode 12a is disposed on dielectric sheet 1b on top of the dielectric sheet 1c and shielding electrode 12d is disposed on the dielectric sheet le underneath the dielectric sheet 1d, respectively.
  • Shielding electrodes 12a and 12b are respectively connected to the ground terminals 4a and 4b.
  • the purpose of these shielding electrodes 12a and 12b on the upper face of the topmost inner layer and the bottom layer of the laminated filter is to vertically sandwich the components of a filter circuit disposed on an inner part of the laminated body 2, i.e., the resonator electrodes 5, I/O electrodes 6 loading capacitor electrode 10, stub electrode or electrodes 13, and coupling electrode 8; so as to improve the shielding capability of the laminated filter.
  • Each stub electrode 13 includes a strip disposed on the dielectric sheet 1d at a position which does not overlap any portion of the resonator electrode 5 through the dielectric sheet 1c. One end of each stub electrode 13 is connected to an I/O electrode 6, and the other end is an open-circuit end.
  • Each stub electrode 13 is a 1/4-wavelength strip line.
  • impedance at the open-circuit end becomes 0.
  • these signals are short-circuited, generating attenuation pole 14 within the frequency characteristics as shown in the attenuation - frequency curve shown in Fig. 4.
  • the laminated filter of the present invention can be made smaller.
  • the laminated filter demonstrates high performance.
  • each stub electrode 13 is connected to an I/O electrode 6, and the other end is extended toward the short-circuit end 5a of the resonator electrode 5. If, however, the stub electrode 13 were to extend toward the open-circuit end 5b of a corresponding resonator electrode 5 and were disposed facing resonator electrode 5 across dielectric sheet 1c, the stub electrode 13 would form a capacitance coupling with the resonator electrode 5 across dielectric sheet 1c because the open-circuit end 5b of the resonator electrode 5 has a strong capacitance coupling capability. This will prevent generation of the attenuation pole 14 shown in Fig. 4, resulting in the formation of only I/O capacitance 7 shown in Fig. 3.
  • the laminated filter of the present invention secures a larger attenuation and prevents capacitance coupling between the stub electrode and the resonator electrode by connecting the stub electrode to the I/O electrode. Accordingly, the present invention enables the required frequency characteristics to be achieved and also provides for a smaller-sized laminated filter.
  • the preferred embodiment of the present invention is explained in details with reference to the case when a dielectric sheet on which a resonator electrode is formed and a dielectric sheet on which an I/O electrode is formed are laminated adjacent each other.
  • the invention may be practiced or embodied in still other combinations.
  • another dielectric sheet may be disposed between these two dielectric sheets (which are dielectric sheets shown as sheets 1c and 1d as shown in Fig. 2).
  • the essential characteristic of the invention is that the resonator electrode and I/O electrode are facing each other through a dielectric sheet or sheets.
  • the preferred embodiment described herein is therefore illustrative and not restrictive. The scope of the invention is indicated by the appended claims.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Acoustics & Sound (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)

Description

    FIELD OF THE INVENTION
  • The present invention relates to the field of laminated filters used for products such as communications equipment.
  • In general, laminated filters are configured by providing resonator electrodes in parallel on an inner layer within a stack of several laminated dielectric sheets, and an I/O electrode at a position facing the resonator electrodes through this inner layer of the dielectric sheets.
  • To improve the frequency characteristics of laminated filters, another resonator electrode and capacitance are connected in series to form a resonator electrode for notching, and connected to the laminated filter. This resonator electrode for notching generates an attenuation pole within the frequency characteristics, steepening the frequency characteristics curve.
  • However, when a resonator electrode for notching is provided within a laminated filter, in addition to the resonator electrodes, additional -space is desirable for a) the resonator electrode for notching and b) an electrode for providing capacitance. Thus, it is difficult to produce laminated filters of a reduced size.
  • A conventional dielectric laminated filter in which a plurality of dielectric sheets are laminated is described in EP 0 837 517. The laminated filter comprises a dielectric sheet on which a plurality of resonance electrodes is formed. It further comprises another dielectric sheet having a coupling line connected in series with I/O lines. Said plurality of resonance electrodes are electromagnetic coupled through said coupling line. This document belongs to the state of the art under Art. 54(3) EPC.
  • A laminated filter of the present invention comprises a laminated body created by laminating a plurality of dielectric sheets, a plurality of resonator electrodes disposed on the same layer within an inner part of the laminated body, and a first input-output electrode disposed on the inner part of the laminated body at a position facing one of the resonator electrodes for input through the dielectric sheet, a second input-output electrode disposed on the inner part of the laminated body at a position facing one of the resonator electrodes for output through the dielectric sheet. One end of at least one of the first and second input-output electrodes is connected to a stub electrode which has one open-circuit end, and which is disposed at a position not overlapping said resonator electrodes. Said plurality of resonator electrodes are electromagnetic coupled by a coupling electrode which is disposed facing portions of said resonatorrelectrodes and which is unconnected to the input-output electrodes.
  • By connecting the stub electrodes to the I/O electrodes, a large attenuation is achieved and, at the same time, the size of the laminated filter can be reduced.
    • BRIEF DESCRIPTION OF THE DRAWINGS
    • Fig. 1 is a perspective view of a laminated filter in accordance with a preferred embodiment of the present invention.
    • Fig. 2 is an exploded perspective view of the laminated filter in accordance with the preferred embodiment of the present invention.
    • Fig. 3 is an equivalent circuit of the laminated filter in accordance with the preferred embodiment of the present invention.
    • Fig. 4 shows the frequency characteristics of the laminated filter in accordance with the preferred embodiment of the present invention.
    DESCRIPTION OF PREFERRED EMBODIMENT
  • A laminated filter in a preferred embodiment of the present invention is explained with reference to Figs. 1 to 4.
  • As shown in Fig. 2, dielectric sheets 1a to le are made of generally rectangular ceramic dielectric sheets but other shapes may be used. These dielectric sheets 1a to 1e are laminated together to form laminated body 2 including a plurality of inner dielectric sheets 1b, 1c and 1d forming an inner part. Input-output (I/O) terminals 3a and 3b and ground terminals 4a and 4b are disposed, as shown in Fig. 1, at the side faces of the laminated body 2. In the preferred embodiment as shown in Fig. 2, the I/ O terminals 3a and 3b are disposed on opposed side faces.
  • One of two resonator electrodes 5 forms part of an input resonance circuit, and the other forms part of an output resonance circuit. These two resonator electrodes 5 are disposed on dielectric sheet 1c. For each resonator electrode 5, one end is connected to the ground terminal 4a, forming a short-circuit end 5a, and the other end extends towards ground terminal 4b and forms an open-circuit end 5b.
  • Input-output (I/O) electrodes 6 are disposed on dielectric sheet 1d. One end of each I/O electrode 6 is connected to a corresponding I/ O terminal 3a or 3b. The other end of each I/O electrode 6 is located at a position facing the open-circuit end 5b of one of the resonator electrodes 5 for input and output through the dielectric sheet 1c, forming input-output (I/O) capacitance 7 shown in Fig. 3.
  • A coupling electrode 8 is disposed on dielectric sheet 1d. Coupling electrode 8 is disposed facing portions of both resonator electrodes 5which are placed side by side, and through the dielectric sheet 1c, creating an inter-stage coupling capacitance 9 shown in Fig. 3.
  • A loading capacitor electrode 10 is disposed on the dielectric sheet 1d. One end of the loading capacitor electrode 10 is connected to the ground terminal 4b, and the other end is disposed at a position facing the open-circuit end 5b of the resonator electrode 5 through the dielectric sheet 1c, creating a loading capacitance 11 shown in Fig. 3.
  • Shielding electrode 12a is disposed on dielectric sheet 1b on top of the dielectric sheet 1c and shielding electrode 12d is disposed on the dielectric sheet le underneath the dielectric sheet 1d, respectively. Shielding electrodes 12a and 12b are respectively connected to the ground terminals 4a and 4b. The purpose of these shielding electrodes 12a and 12b on the upper face of the topmost inner layer and the bottom layer of the laminated filter is to vertically sandwich the components of a filter circuit disposed on an inner part of the laminated body 2, i.e., the resonator electrodes 5, I/O electrodes 6 loading capacitor electrode 10, stub electrode or electrodes 13, and coupling electrode 8; so as to improve the shielding capability of the laminated filter.
  • Each stub electrode 13 includes a strip disposed on the dielectric sheet 1d at a position which does not overlap any portion of the resonator electrode 5 through the dielectric sheet 1c. One end of each stub electrode 13 is connected to an I/O electrode 6, and the other end is an open-circuit end.
  • Each stub electrode 13 is a 1/4-wavelength strip line. When the frequency of signals input to the stub electrode 13 is a resonance frequency, impedance at the open-circuit end becomes 0. In other words, when the signals input to the laminated filter coincide with the resonance frequency, these signals are short-circuited, generating attenuation pole 14 within the frequency characteristics as shown in the attenuation - frequency curve shown in Fig. 4.
  • Consequently, a resonator electrode for notching normally used for generating an attenuation pole in a laminated filter of the prior art can be eliminated. This means that of the space required for an electrode used to form capacitance is not needed. Thus, the laminated filter of the present invention can be made smaller. In addition, the laminated filter demonstrates high performance.
  • As above, one end of each stub electrode 13 is connected to an I/O electrode 6, and the other end is extended toward the short-circuit end 5a of the resonator electrode 5. If, however, the stub electrode 13 were to extend toward the open-circuit end 5b of a corresponding resonator electrode 5 and were disposed facing resonator electrode 5 across dielectric sheet 1c, the stub electrode 13 would form a capacitance coupling with the resonator electrode 5 across dielectric sheet 1c because the open-circuit end 5b of the resonator electrode 5 has a strong capacitance coupling capability. This will prevent generation of the attenuation pole 14 shown in Fig. 4, resulting in the formation of only I/O capacitance 7 shown in Fig. 3.
  • Thus, the laminated filter of the present invention secures a larger attenuation and prevents capacitance coupling between the stub electrode and the resonator electrode by connecting the stub electrode to the I/O electrode. Accordingly, the present invention enables the required frequency characteristics to be achieved and also provides for a smaller-sized laminated filter.
  • The preferred embodiment of the present invention is explained in details with reference to the case when a dielectric sheet on which a resonator electrode is formed and a dielectric sheet on which an I/O electrode is formed are laminated adjacent each other. The invention may be practiced or embodied in still other combinations. For example, another dielectric sheet may be disposed between these two dielectric sheets (which are dielectric sheets shown as sheets 1c and 1d as shown in Fig. 2). The essential characteristic of the invention is that the resonator electrode and I/O electrode are facing each other through a dielectric sheet or sheets. The preferred embodiment described herein is therefore illustrative and not restrictive. The scope of the invention is indicated by the appended claims.
    • Reference numerals
    • 1a to 1e
    dielectric sheet
    2
    laminated body
    3a, 3b
    input-output (I/O) terminals
    4a, 4b
    ground terminal
    5
    resonator electrode
    5a
    short-circuit end
    5b
    open-circuit end
    6
    input-output (I/O) electrode
    7
    input-output (I/O) capacitance
    8
    coupling electrode
    9
    inter-stage coupling capacitance
    10
    loading capacitor
    11
    loading capacitance
    12a, 12b
    shielding electrodes
    13
    stub electrode
    14
    attenuation pole

Claims (3)

  1. A laminated filter comprising:
    a laminated body (2) created by laminating a plurality of dielectric sheets (1 a, 1 b, 1 c, 1d, 1e) together;
    a plurality of resonator electrodes (5) disposed on a first (1c) of said plurality of dielectric sheets, and including an input resonator electrode and an output resonator electrode;
    a first input-output electrode (6) disposed on a second (1d) of said plurality of dielectric sheets;
    a second input-output electrode (6) disposed on said second (1d) of said dielectric sheets, said second (1d) of said dielectric sheets disposed parallel to said first (1c) of said dielectric sheets ; and
    a coupling electrode (8) disposed on said second (1 d) of said dielectric sheets;
    wherein said first input-output electrode (6) is disposed facing said input resonator electrode, said second input-output electrode (6) is disposed facing said output resonator electrode, and at least one of said first and second input-output electrodes is coupled to a stub electrode (13) disposed on said second (1d) of said dielectric sheets and having an open-circuit end,
    said coupling electrode (8) is disposed facing portions of said resonator electrodes (5) and is unconnected to other electrodes; and
    said stub electrode (13) is disposed at a position not overlapping said resonator electrodes (5).
  2. A laminated filter according to claim 1 further comprising first (4a) and second (4b) ground terminals disposed at opposing side faces of said laminated body (2) and each resonator electrode (5) having a further open circuit end (5b) and a short circuit end (5a); wherein
    each of said short-circuit ends (5a) is coupled to said first ground terminal (4a);
    each of said open-circuit ends (5b) extends towards said second ground terminal (4b); and
    said open-circuit end of each stub electrode (13) extends towards said first ground terminal (4a).
  3. A laminated filter according to claim 2, further comprising:
    a duality of shielding electrodes (12a, 12b), each shielding electrode disposed within said laminated filter, and vertically sandwiching said resonator electrodes (5), said first and second input-output electrodes (6), said at least one stub electrode (13), and said coupling electrode (8); and
    each of said shielding electrodes (12a, 12b) being coupled to each of said first (4a) and said second (4b) ground terminals.
EP99100880A 1998-01-20 1999-01-19 Laminated filter Expired - Lifetime EP0930701B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP10008313A JPH11205006A (en) 1998-01-20 1998-01-20 Laminated filter
JP831398 1998-01-20

Publications (3)

Publication Number Publication Date
EP0930701A2 EP0930701A2 (en) 1999-07-21
EP0930701A3 EP0930701A3 (en) 2001-06-06
EP0930701B1 true EP0930701B1 (en) 2006-04-05

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EP99100880A Expired - Lifetime EP0930701B1 (en) 1998-01-20 1999-01-19 Laminated filter

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US (1) US6191669B1 (en)
EP (1) EP0930701B1 (en)
JP (1) JPH11205006A (en)
KR (1) KR100462698B1 (en)
DE (1) DE69930680T2 (en)

Families Citing this family (36)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7336468B2 (en) * 1997-04-08 2008-02-26 X2Y Attenuators, Llc Arrangement for energy conditioning
US9054094B2 (en) 1997-04-08 2015-06-09 X2Y Attenuators, Llc Energy conditioning circuit arrangement for integrated circuit
US6603646B2 (en) * 1997-04-08 2003-08-05 X2Y Attenuators, Llc Multi-functional energy conditioner
US7301748B2 (en) 1997-04-08 2007-11-27 Anthony Anthony A Universal energy conditioning interposer with circuit architecture
US7321485B2 (en) 1997-04-08 2008-01-22 X2Y Attenuators, Llc Arrangement for energy conditioning
US7274549B2 (en) * 2000-12-15 2007-09-25 X2Y Attenuators, Llc Energy pathway arrangements for energy conditioning
EP1067618B1 (en) * 1999-07-08 2007-12-12 Matsushita Electric Industrial Co., Ltd. Laminated filter, duplexer, and mobile communication apparatus using the same
JP2004522295A (en) * 2000-10-17 2004-07-22 エックストゥーワイ アテニュエイターズ，エル．エル．シー． Amalgam consisting of shielded and shielded energy paths and other elements for single or multiple circuits with common reference nodes
US7193831B2 (en) * 2000-10-17 2007-03-20 X2Y Attenuators, Llc Energy pathway arrangement
JP4030871B2 (en) * 2000-12-12 2008-01-09 独立行政法人科学技術振興機構 Electric vehicle steering mechanism
US20020158305A1 (en) * 2001-01-05 2002-10-31 Sidharth Dalmia Organic substrate having integrated passive components
AU2002256038B2 (en) * 2001-04-02 2006-07-06 X2Y Attenuators, Llc Offset pathway arrangements for energy conditioning
KR100432846B1 (en) * 2001-05-10 2004-05-24 전자부품연구원 Stacked dielectric filter capable of controlling the amount of magnetic coupling
KR100430253B1 (en) * 2002-05-10 2004-05-03 엘지이노텍 주식회사 Method for manufacturing filter circuit using strip line
KR20030092443A (en) * 2002-05-29 2003-12-06 엘지이노텍 주식회사 Band Pass Filter for Radio Frequency
US7260890B2 (en) 2002-06-26 2007-08-28 Georgia Tech Research Corporation Methods for fabricating three-dimensional all organic interconnect structures
US6987307B2 (en) * 2002-06-26 2006-01-17 Georgia Tech Research Corporation Stand-alone organic-based passive devices
US6900708B2 (en) * 2002-06-26 2005-05-31 Georgia Tech Research Corporation Integrated passive devices fabricated utilizing multi-layer, organic laminates
US7180718B2 (en) * 2003-01-31 2007-02-20 X2Y Attenuators, Llc Shielded energy conditioner
US7489914B2 (en) * 2003-03-28 2009-02-10 Georgia Tech Research Corporation Multi-band RF transceiver with passive reuse in organic substrates
CN1890854A (en) 2003-12-22 2007-01-03 X2Y艾泰钮埃特有限责任公司 Internally shielded energy conditioner
US8345433B2 (en) * 2004-07-08 2013-01-01 Avx Corporation Heterogeneous organic laminate stack ups for high frequency applications
US20060077020A1 (en) * 2004-10-13 2006-04-13 Cyntec Company Circuits and manufacturing configurations of compact band-pass filter
US7817397B2 (en) 2005-03-01 2010-10-19 X2Y Attenuators, Llc Energy conditioner with tied through electrodes
US7630188B2 (en) 2005-03-01 2009-12-08 X2Y Attenuators, Llc Conditioner with coplanar conductors
KR101390426B1 (en) 2006-03-07 2014-04-30 엑스2와이 어테뉴에이터스, 엘.엘.씨 Energy conditioner structures
US7439840B2 (en) 2006-06-27 2008-10-21 Jacket Micro Devices, Inc. Methods and apparatuses for high-performing multi-layer inductors
US7808434B2 (en) * 2006-08-09 2010-10-05 Avx Corporation Systems and methods for integrated antennae structures in multilayer organic-based printed circuit devices
US7989895B2 (en) 2006-11-15 2011-08-02 Avx Corporation Integration using package stacking with multi-layer organic substrates
JP2008278360A (en) 2007-05-02 2008-11-13 Ngk Spark Plug Co Ltd Laminate type band pass filter and diplexer using the same
JP5633708B2 (en) * 2012-04-05 2014-12-03 Tdk株式会社 Multilayer bandpass filter
KR101431005B1 (en) * 2012-05-31 2014-08-20 주식회사 릿치마이크로웨이브 3-dimensional laminated dielectric resonator assembly
KR101333165B1 (en) * 2013-07-11 2013-11-27 주식회사 티에프티 Incombustible bushing for transformer and method for manufacturing the same
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US11682816B2 (en) * 2019-08-22 2023-06-20 Mediatek Inc. Filter circuits

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3115149B2 (en) * 1993-03-31 2000-12-04 日本碍子株式会社 Multilayer dielectric filter
DE69432060T2 (en) * 1993-08-24 2003-11-20 Matsushita Electric Industrial Co., Ltd. Layered dielectric antenna switch
JP3509820B2 (en) * 1994-07-08 2004-03-22 宇部興産株式会社 Stripline type filter
JP3558696B2 (en) * 1994-08-26 2004-08-25 日本無線株式会社 Multilayer dielectric filter
JPH08213805A (en) * 1995-02-03 1996-08-20 Matsushita Electric Ind Co Ltd Laminated filter
JP3050103B2 (en) * 1995-10-19 2000-06-12 松下電器産業株式会社 Multilayer filter and filter device using the same
US5892415A (en) * 1995-11-20 1999-04-06 Murata Manufacturing Co., Ltd. Laminated resonator and laminated band pass filter using same
JPH09153703A (en) * 1995-11-28 1997-06-10 Hitachi Metals Ltd Dielectric laminated filter
DE69736617T2 (en) * 1996-10-18 2007-01-04 Matsushita Electric Industrial Co., Ltd., Kadoma Dielectric laminated band elimination filter with electromagnetic coupling between resonators

Also Published As

Publication number Publication date
KR100462698B1 (en) 2004-12-20
DE69930680D1 (en) 2006-05-18
DE69930680T2 (en) 2006-08-24
JPH11205006A (en) 1999-07-30
EP0930701A3 (en) 2001-06-06
EP0930701A2 (en) 1999-07-21
US6191669B1 (en) 2001-02-20
KR19990068244A (en) 1999-08-25

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